<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <a href="#/home">home</a>
      <a href="#/about">about</a>

      <div class="content">Default</div>
    </div>

    <script>
      // hash: 监听hash的改变，改变后在某个位置渲染对应的内容，但是页面不发生刷新；；

      const contentEl = document.querySelector('.content')

      window.addEventListener('hashchange', () => {
        switch (location.hash) {
          case '#/home':
            contentEl.innerHTML = 'home'
            break
          case '#/about':
            contentEl.innerHTML = 'about'
            break
          default:
            contentEl.innerHTML = 'Default'
        }
      })
    </script>
  </body>
</html>
